NICD Situation Report on Listeriosis Outbreak, South Africa (16 Jan)

  • The outbreak continues, with 19 additional cases recorded since the last update. \
  • At present, the source of the outbreak is not known.
  • Cases of listeriosis will continue to be investigated, with trace back and further investigation of any positive food/environmental samples.
  • Outcome data is now available for 30% (235/767) of cases, of which 34% (81/235) died.

As of 16 January 2018, a total of 767 laboratory-confirmed listeriosis cases have been reported to NICD since 01 January 2017 (Figure 1). Most cases have been reported from Gauteng Province (60%, 462/767) followed by Western Cape (13%, 101/767) and KwaZuluNatal (7%, 55/767) provinces.

Cases have been diagnosed in both public (66%, 507/767) and private (34%, 260/767) healthcare sectors. Diagnosis was based most commonly on the isolation of Listeria monocytogenes in blood culture (71%, 542/767), followed by CSF (24%, 181/748). Where age was reported (n=735), ages range from birth to 93 years (median 26 years) and 41% (303/735) are neonates aged ≤28 days (Figure 2). Of neonatal cases, 96% (291/303) had early-onset disease (birth to ≤6 days). Females account for 55% (405/731) of cases where gender is reported.

Final outcome data is available for 30% (235/767) of cases, of which 34% (81/235) died.

 

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Source: National Institute for Communicable Diseases